skia/tools/SkMetaData.h at main · AndroidHighQualityCodeStudy/skia · GitHub

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* Use of this source code is governed by a BSD-style license that can be

* found in the LICENSE file.

#ifndef SkMetaData_DEFINED

#define SkMetaData_DEFINED

#include "include/core/SkScalar.h"

/** A map from c-string keys to arrays of POD (int32_t, kScalar, void*, or bool)

values.

class SkMetaData {

public:

SkMetaData() {}

~SkMetaData() { if (fRec) { this->reset(); } }

void reset();

bool findS32(const char name[], int32_t* value = nullptr) const;

bool findScalar(const char name[], SkScalar* value = nullptr) const;

const SkScalar* findScalars(const char name[], int* count,

SkScalar values[] = nullptr) const;

bool findPtr(const char name[], void** value = nullptr) const;

bool findBool(const char name[], bool* value = nullptr) const;

bool hasS32(const char name[], int32_t value) const {

int32_t v;

return this->findS32(name, &v) && v == value;

}

bool hasScalar(const char name[], SkScalar value) const {

SkScalar v;

return this->findScalar(name, &v) && v == value;

}

bool hasPtr(const char name[], void* value) const {

void* v;

return this->findPtr(name, &v) && v == value;

}

bool hasBool(const char name[], bool value) const {

bool v;

return this->findBool(name, &v) && v == value;

}

void setS32(const char name[], int32_t value);

void setScalar(const char name[], SkScalar value);

SkScalar* setScalars(const char name[], int count, const SkScalar values[] = nullptr);

void setPtr(const char name[], void* value);

void setBool(const char name[], bool value);

bool removeS32(const char name[]);

bool removeScalar(const char name[]);

bool removePtr(const char name[]);

bool removeBool(const char name[]);

enum Type {

kS32_Type,

kScalar_Type,

kPtr_Type,

kBool_Type,

kTypeCount

};

struct Rec;

class Iter;

friend class Iter;

class Iter {

public:

Iter() : fRec(nullptr) {}

Iter(const SkMetaData&);

/** Reset the iterator, so that calling next() will return the first

data element. This is done implicitly in the constructor.

void reset(const SkMetaData&);

/** Each time next is called, it returns the name of the next data element,

or null when there are no more elements. If non-null is returned, then the

element's type is returned (if not null), and the number of data values

is returned in count (if not null).

const char* next(Type*, int* count);

private:

Rec* fRec;

};

public:

struct Rec {

Rec* fNext;

uint16_t fDataCount; // number of elements

uint8_t fDataLen; // sizeof a single element

uint8_t fType;

const void* data() const { return (this + 1); }

void* data() { return (this + 1); }

const char* name() const { return (const char*)this->data() + fDataLen * fDataCount; }

char* name() { return (char*)this->data() + fDataLen * fDataCount; }

static Rec* Alloc(size_t);

static void Free(Rec*);

};

Rec* fRec = nullptr;

const Rec* find(const char name[], Type) const;

void* set(const char name[], const void* data, size_t len, Type, int count);

bool remove(const char name[], Type);

SkMetaData(const SkMetaData&) = delete;

SkMetaData& operator=(const SkMetaData&) = delete;

private:

struct FindResult {

SkMetaData::Rec* rec;

SkMetaData::Rec* prev;

};

FindResult findWithPrev(const char name[], Type type) const;

void remove(FindResult);

};

#endif

skia/tools/SkMetaData.h at main · AndroidHighQualityCodeStudy/skia · GitHub

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